import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class EchoClient {
    private DatagramSocket socket = null;
    private String serverIp;
    private int serverPort;
    public EchoClient(String serverIp, int serverPort) throws SocketException {
        this.serverIp=serverIp;
        this.serverPort=serverPort;
        socket = new DatagramSocket();
    }
    public void stary() throws IOException {
        System.out.println("客户端启动");
        Scanner scanner = new Scanner(System.in);
        while(true){
            System.out.println("->");
            if(!scanner.hasNext()){
                break;
            }
            String request = scanner.next();
            DatagramPacket requestPacket = new DatagramPacket(request.getBytes(),request.getBytes().length,
                    InetAddress.getByName(serverIp),serverPort);
            socket.send(requestPacket);

            DatagramPacket responsePacket = new DatagramPacket(new byte[4096],4096);
            socket.receive(responsePacket);

            String response = new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException {
        EchoClient client = new EchoClient("127.0.0.1",9090);
        client.stary();
    }

}
